from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button

class instruction_layout( BoxLayout ):
    def __init__( self, **kwargs ):
        super( instruction_layout, self ).__init__( **kwargs )
        self.add_widget( Button( text = 'test') )
    
    
if __name__ == '__main__':
    from kivy.app import App
    class testApp( App ):
        def build( self ):
            return instruction_layout()
    testApp().run()